Originally Posted by
go@midnavi.com
I opened it up and confirmed the part is HomeLink PSI A1938200105. As you pointed out, it looks like these can be found used for around $40. Thanks!
As GG pointed out that is not the part, the part you want is the one covered in a thin layer of black foam. It sits on top of or behind the door opener, my mistake.
I doubt there is anything wrong with the one you have, maybe the sensors are at fault. You use the word alternative sensors and that may be the problem right there. See Urbsne’s post on sensors.